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Thread: looking for dividing tables
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20th December 2011, 10:40 AM #1GOLD MEMBER
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looking for dividing tables
G,dsay can anyone help me with a copy of or where i can download a table for dividing head settings . as in where to line up the holes in a set of "parkinson indexing plates "
for a mate not me cos i know nothing about them .
johno'If the enemy is in range, so are you.'
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20th December 2011, 02:53 PM #2Philomath in training
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Try here -
Steve Bedair's 9 x 20 Lathe Page
Michael
(Check that he has the right ratio though)
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20th December 2011, 10:07 PM #3
Mate you don't need no tables only 2 formulas for any and all dividing heads
I will keep it simple most dividing heads are 40/1 reduction so ill use that, if your head is a 60, 80 or a completely stupid reduction like 55 then substitute that into the top of the formula below
Turns = reduction eg 40
................divisions
For angles:
Turns degrees = 8degrees
..........................angle
ok ill do some examples, divisions of 8 and an angle of 35 degrees on 40 and 60 reduction
1#
Turns = 40
............8
= 5 find a common factor and simplify
...1
8 holes = 5 full turns on a 40/1 reduction head
2#
Turns = 60
............8
=7 turns 1 ok now find the largest dividable
............2 set of hole spacings... lets say 36
8 holes = 7 full turns and 18 holes on the 36 hole plate
Have I lost you yet? no? stay tunedhappy turning
Patrick
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20th December 2011, 10:37 PM #4
Ok so ill show you how to work out an angle now its dead easy mate
What ever reduction your diving head uses, Divide that into 360degr
example.
360 = 8degr
40
360 = 6degr
60
Ok so now you know how many degrees your dividing head moves with one full turn on the dividing plate you can take your formula below...
Turns = ....... angle
..........degrees per turn
Edit: I now realize my formula in the post above is wrong BUT this IS correct
ok ill do an example with 35degr
1#
Turns = 35 = 4 turns and 3 ... Again look for the biggest common
............8 ....................8 ....hole set on your plates..16,24 & 32
35degrees = 4 full turns and 12 holes on a 32 hole plate on a 40/1 reduction head
#2
turns = 35 = 5 turns and 5
...........6.. ................. 6
35degrees = 5 full turns and 20 holes on a 24 hole plate on a 60/1 reduction head
Tip ALWAYS look for the largest hole set available with your dividing head... It is more accurate and turning the handle will be easier
I hope these formulas were clear if not get a black bookhappy turning
Patrick
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20th December 2011, 10:50 PM #5GOLD MEMBER
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ok thanks guys it dont mean much to me at the moment , i will need to study it when i do get a lathe or mill , but i can print out this info and give it to my mate .
if my old man was still around i could just bash his ear for all this stuff but he is gone .
i also had a very handy mate live next door to me when i was in brissy he is a wizzard on workshop machinery . one of you blokes could even know my old mate from next door .
he worked for rheem cam p........ck
johno'If the enemy is in range, so are you.'
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20th December 2011, 11:03 PM #6
Heres one.
Kev."Outside of a dog a book is man's best friend ,inside a dog it's too dark to read"
Groucho Marx
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20th December 2011, 11:07 PM #7
lol I somehow spent all evening writing that where does the time go I hope it helped
happy turning
Patrick
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